Charging base



FIG. 1 is a perspective view of a charging base according to my new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a back elevation view thereof;

FIG. 4 is a right side elevation view thereof;

FIG. 5 is a left side elevation view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken lines are directed to environment and are for illustrative purposes only. The broken lines form no part of any embodiment of the claimed design. 

CLAIM The ornamental design for a charging base, as shown and described. 